# HG changeset patch
# User Mike Becker <universe@uap-core.de>
# Date 1766574033 -3600
# Node ID e5a8c41ecb58c840765c106b477f25f0fdf3ceb4
# Parent  9c995cba33930123d29e7920acc26b804a23ef85
adds support for CxHashKey pointers in CX_HASH_KEY() and all map functions

diff -r 9c995cba3393 -r e5a8c41ecb58 CHANGELOG
--- a/CHANGELOG	Wed Dec 24 11:53:40 2025 +0100
+++ b/CHANGELOG	Wed Dec 24 12:00:33 2025 +0100
@@ -10,6 +10,7 @@
  * adds cxMapCompare()
  * adds line continuation support to CxProperties / CxPropertiesConfig
  * adds cx_hash_key_as_string()
+ * adds support for CxHashKey pointers in CX_HASH_KEY() and all map functions
  * adds cx_bstr() and cx_bstr_m()
  * adds cxBufferMaximumCapacity()
  * adds cxBufferAppendString()
diff -r 9c995cba3393 -r e5a8c41ecb58 docs/Writerside/topics/about.md
--- a/docs/Writerside/topics/about.md	Wed Dec 24 11:53:40 2025 +0100
+++ b/docs/Writerside/topics/about.md	Wed Dec 24 12:00:33 2025 +0100
@@ -37,6 +37,7 @@
 * adds cxMapCompare()
 * adds line continuation support to CxProperties / CxPropertiesConfig
 * adds cx_hash_key_as_string()
+* adds support for CxHashKey pointers in CX_HASH_KEY() and all map functions
 * adds cx_bstr() and cx_bstr_m()
 * adds cxBufferMaximumCapacity()
 * adds cxBufferAppendString()
diff -r 9c995cba3393 -r e5a8c41ecb58 src/cx/hash_key.h
--- a/src/cx/hash_key.h	Wed Dec 24 11:53:40 2025 +0100
+++ b/src/cx/hash_key.h	Wed Dec 24 12:00:33 2025 +0100
@@ -192,18 +192,30 @@
  * You should never need to use this manually.
  *
  * @param key the key
- * @return a copy of the key
+ * @return a copy of the key (not the data)
  */
 cx_attr_nodiscard
 CX_INLINE CxHashKey cx_hash_key_identity(CxHashKey key) {
     return key;
 }
 
+/**
+ * The dereference function for the CX_HASH_KEY() macro.
+ * You should never need to use this manually.
+ *
+ * @param key a pointer to a key
+ * @return a copy of the key (not the data)
+ */
+cx_attr_nodiscard
+CX_INLINE CxHashKey cx_hash_key_deref(const CxHashKey *key) {
+    return *key;
+}
+
 #ifndef __cplusplus
 /**
  * Creates a hash key from any of the supported types with implicit length.
  *
- * Does nothing when passing a CxHashkey.
+ * Does nothing when passing a CxHashKey and dereferences CxHashKey pointers.
  *
  * Supported types are UCX strings, zero-terminated C strings,
  * and 32-bit or 64-bit unsigned integers.
@@ -212,6 +224,8 @@
  * @returns the @c CxHashKey
  */
 #define CX_HASH_KEY(key) _Generic((key), \
+        CxHashKey*: cx_hash_key_deref, \
+        const CxHashKey*: cx_hash_key_deref, \
         CxHashKey: cx_hash_key_identity, \
         cxstring: cx_hash_key_cxstr, \
         cxmutstr: cx_hash_key_mutstr, \
@@ -255,6 +269,10 @@
     return key;
 }
 
+CX_CPPDECL CxHashKey CX_HASH_KEY(const CxHashKey *key) {
+    return *key;
+}
+
 CX_CPPDECL CxHashKey CX_HASH_KEY(cxstring str) {
     return cx_hash_key_cxstr(str);
 }
diff -r 9c995cba3393 -r e5a8c41ecb58 tests/test_hash_key.c
--- a/tests/test_hash_key.c	Wed Dec 24 11:53:40 2025 +0100
+++ b/tests/test_hash_key.c	Wed Dec 24 12:00:33 2025 +0100
@@ -61,6 +61,21 @@
     }
 }
 
+CX_TEST(test_hash_key_from_pointer_to_another_key) {
+    CxHashKey k = CX_HASH_KEY("one key");
+    CX_TEST_DO {
+        const CxHashKey *p1 = &k;
+        CxHashKey *p2 = &k;
+        CxHashKey k1 = CX_HASH_KEY(p1);
+        CxHashKey k2 = CX_HASH_KEY(p2);
+        CX_TEST_ASSERT(0 == cx_hash_key_cmp(&k, &k1));
+        CX_TEST_ASSERT(0 == cx_hash_key_cmp(&k, &k2));
+        // check that this did not copy the data
+        CX_TEST_ASSERT(k.data == k1.data);
+        CX_TEST_ASSERT(k.data == k2.data);
+    }
+}
+
 CX_TEST(test_hash_key_int_functions) {
     uint32_t a = 0xabc01337u;
     uint64_t b = 0xabc0133747110815ull;
@@ -177,6 +192,7 @@
     CxTestSuite *suite = cx_test_suite_new("hash_key");
 
     cx_test_register(suite, test_hash_key_functions);
+    cx_test_register(suite, test_hash_key_from_pointer_to_another_key);
     cx_test_register(suite, test_hash_key_int_functions);
     cx_test_register(suite, test_hash_key_macro);
     cx_test_register(suite, test_hash_key_cmp);